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为了制作供稠密波分复用用的波长可编程光纤布拉格光栅，朗讯技术公司贝尔实验室的研究人员已发明一种能锁住磁力的方法。该方法不同于以前以热调节、利用压电传感器和磁致伸缩为基础的方案，而是通过波长移动时提供锁住能力，它无需维持功率，具有很大调制范围和高的调谐速度
To make a wavelength-programmable fiber Bragg grating for dense wavelength division multiplexing, researchers at Bell Labs, a Lucent Technologies company, have invented a way to lock in a magnetic force. Unlike previous approaches based on thermal regulation, using piezoelectric sensors and magnetostrictives, this method provides lock-in capability by moving wavelengths without the need of maintaining power, with a large modulation range and high tuning speed